Afirm is considering two location alternatives. at location a, fixed costs would be $4,000,000 per year, and variable costs $0.30 per unit. at alternative b, fixed costs would be $3,600,000 per year, with variable costs of $0.35 per unit. if annual demand is expected to be 10 million units, which plant offers the lowest total cost? group of answer choices: a) plant b, because it is cheaper than plant a for all volumes over 8,000,000 units. b) neither plant a nor plant b, because the crossover point is at 10 million units. c) plant a, because it is cheaper than plant b for all volumes. d) plant b, because it has the lower variable cost per unit. e) plant a, because it is cheaper than plant b for all volumes over 8,000,000 units.